4, The Product Uses DETDA Is A Very Effective Chain Extender Of Polyurethane Elastomers, Particularly Suitable For RIM (Reaction Injection Molding) And SPUA (Spray Polyurea Elastomer) On; Also Be Used As A Polyurethane Elastomer And The Aromatic Epoxy Resin Diamine Curing Agent, Used For Casting, Coating, RIM And Adhesive Is Polyurethane And Polyurea Elastomer Chain Extender. DETDA Is A Sterically Hindered Aromatic Diamine, Ethyl And Methyl Steric Hindrance Such That Its Activity Is Much Lower Than That Of Toluene Diamine (TDA). It Is The Reaction Rate Of The Polyurethane Prepolymer Is Several Times Faster Than DMTDA, About 30 Times Faster Than MOCA. Mainly For RIM Polyurethane Systems And Spray Polyurethane (Urea) Elastomer Coating Systems, With Fast Response, Ejection Time Is Short, High Initial Strength, Hydrolysis Products, Heat And So On. In Addition, This Product Can Also Be Used As Elastomers, Lubricants And Industrial Oils Of Antioxidants, And Chemical Synthesis Intermediates.

These Are Diethyltoluenediamine Physical Properties And Uses, Etc., Such As The Need To Understand Diethyltoluenediamine MSDS Detailed Information, Please See The Back Of The Column In.

Diethyltoluenediamine(DETDA) Production Process

A1C13 with Zn and not as a co-catalyst products. Because the poor thermal stability of AlCl3, easy to coke at high temperatures, and decomposition release HCl, severe corrosion of the equipment. The choice is more appropriate aluminum alkyl catalyst, which use TEA, the conversion rate and reactivity are high. In this study, TEA as a synthetic catalyst.

Under these conditions, changes in the amount of catalyst, examine its impact on the synthesis, to reduce the amount of catalyst and reduce costs. When the catalyst amount is less than 15%, the product TDA content increases, the conversion rate, the yield dropped significantly and the material purified difficulties; increase the dosage, synthesis conditions improve small, Huai dosage increased by 1, DETDA improve only 5%, and the viscous material, post-processing difficulties.

We selected according to the following methods and product properties were studied.

A direct distillation method is simple, but at a high temperature, catalyst damage products, low yields, more residue.

In water, it becomes clear two phases facilitate separation, aluminum is easily removed. But the consumption of base volume.

C. water or adding an appropriate amount of lye catalyst is converted to Al (OH) 3 floc, is difficult and the organic phase separated. Al (OH) 3 in entrainment large amounts of organic phase, suffered serious losses.

D. brine large particles Al (OH) 3 precipitates, clear two-phase separation. Add salt, increasing the density of the aqueous phase, the organic phase was reducedSolubility in water and sediment and content of, the separation quickly. High yield, simple operation and low cost.

Selection Method D as a way to remove the catalyst, the experiment proved to be feasible.

Refined

After removal of the catalyst, in addition to crude DETDA, but also contains a variety of aromatic amine derivatives. These substances similar to density, solubility similar, the same chemical properties, separation difficult extraction, crystallization and other physical and chemical methods. DETDA boiling point 308 ℃, boiling point similar to other derivatives, we use vacuum distillation method, lower boiling point, increasing the boiling point difference. Calculated and measured equilibrium equation and calculate the equilibrium curve Mixture, we obtained a better distillation process conditions, so that the average purity of over 98%.

Performance Testing

Products cured in an oven at 120 ℃ in 12h, at room temperature for 7 days, according to the West German standard DNI53504 test product performance and imports considerably:

This product is same as Ethacure 100 and Lonza DETDA 80. It is a good chain extender of PU elastomer, especially for RIM and SPUA. and used as curing agent of polyurethane and epoxy resin; also used as antioxidant in epoxy resin; industrial oil, lubricant. In addition, it can be used as organic synthesis intermediates.